Abstract: We propose to obtain optical spectra of L3-T2 dwarfs to search for H(alpha) emission: a tell-tale signature of magnetospheric or coronal activity. All of the sample targets have been observed as part of the Spitzer Cycle 8 Exploration Science program ``Weather on Other Worlds'' in search for cloud-induced photometric variability. With Spitzer's unprecedented photometric precision, we have found that fully half of all L and T dwarfs are variable. However, the existence of inhomogeneous cloud cover is only one of two factors that could produce variability in ultra-cool dwarfs, the other being magnetically-induced hot or cold spots. While the processes that can support stable magnetic fields in the neutral atmospheres of ultra-cool dwarfs are not well established, a very strong positive correlation is known between magnetic activity and H(alpha) emission. Our GMOS spectroscopic observations will be the first to test for a correlation between chromospheric activity and clouds in L and T dwarfs.